Showing structure for (1s,6r,20s)-20-methyl-17-methylidene-4,7-dioxo-13-oxa-3-azapentacyclo[12.3.2.2³,⁶.0⁸,¹⁶.0¹⁰,¹⁵]henicosa-8(16),9,14-trien-9-yl acetate